Author

HELCOM RED LIST Biotope Expert Team

Textual description

Baltic photic bottoms with at least 90 % coverage of muddy sediment. The sediment must contain at least 20 % of mud, silt or clay (grain size less than 63 µm). No macrovegetation or epibenthic macrofauna. Biomass of infaunal bivalves dominates in the group infaunal bivalves/polychaetes/crustaceans/echinoderms/insect larvae.